<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
<meta name="viewport" content="width=device-width">
<meta name="theme-color" content="#222"><meta name="generator" content="Hexo 7.1.1">

  <link rel="apple-touch-icon" sizes="180x180" href="/images/avatar.jpg">
  <link rel="icon" type="image/png" sizes="32x32" href="/images/avatar.jpg">
  <link rel="icon" type="image/png" sizes="16x16" href="/images/avatar.jpg">
  <link rel="mask-icon" href="/images/avatar.jpg" color="#222">
  <meta name="msvalidate.01" content="4AF2328B2035748153A041B7EEF3D15C">

<link rel="stylesheet" href="/css/main.css">

<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Noto+Serif+SC:300,300italic,400,400italic,700,700italic%7CLobster:300,300italic,400,400italic,700,700italic%7CPingFang+SC:300,300italic,400,400italic,700,700italic%7CRoboto+Mono:300,300italic,400,400italic,700,700italic&display=swap&subset=latin,latin-ext">

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css" integrity="sha256-wiz7ZSCn/btzhjKDQBms9Hx4sSeUYsDrTLg7roPstac=" crossorigin="anonymous">
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.1.1/animate.min.css" integrity="sha256-PR7ttpcvz8qrF57fur/yAx1qXMFJeJFiA6pSzWi0OIE=" crossorigin="anonymous">
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/fancyapps-ui/5.0.33/fancybox/fancybox.css" integrity="sha256-gkQVf8UKZgQ0HyuxL/VnacadJ+D2Kox2TCEBuNQg5+w=" crossorigin="anonymous">

<script class="next-config" data-name="main" type="application/json">{"hostname":"ethanliu6.github.io","root":"/","images":"/images","scheme":"Gemini","darkmode":false,"version":"8.19.2","exturl":true,"sidebar":{"position":"left","display":"always","padding":12,"offset":18},"copycode":{"enable":true,"style":"mac"},"fold":{"enable":true,"height":300},"bookmark":{"enable":true,"color":"#222","save":"manual"},"mediumzoom":true,"lazyload":true,"pangu":false,"comments":{"style":"buttons","active":"changyan","storage":true,"lazyload":false,"nav":null,"activeClass":"changyan"},"stickytabs":false,"motion":{"enable":true,"async":false,"transition":{"menu_item":"fadeInDown","post_block":"fadeIn","post_header":"fadeInDown","post_body":"fadeInDown","coll_header":"fadeInLeft","sidebar":"fadeInUp"}},"i18n":{"placeholder":"搜索...","empty":"没有找到任何搜索结果：${query}","hits_time":"找到 ${hits} 个搜索结果（用时 ${time} 毫秒）","hits":"找到 ${hits} 个搜索结果"},"path":"/search.xml","localsearch":{"enable":true,"trigger":"auto","top_n_per_article":6,"unescape":false,"preload":false}}</script><script src="/js/config.js"></script>

    <meta name="description" content="该篇主要讲解Java中线程通讯、线程池">
<meta property="og:type" content="article">
<meta property="og:title" content="JavaSE进阶——Day09 多线程（二）">
<meta property="og:url" content="http://ethanliu6.github.io/2024/04/27/JavaNotes/JavaSE%E8%BF%9B%E9%98%B6/day09/2024-04-27-JavaSE%E8%BF%9B%E9%98%B6%E2%80%94%E2%80%94Day09-%E5%A4%9A%E7%BA%BF%E7%A8%8B%EF%BC%88%E4%BA%8C%EF%BC%89/index.html">
<meta property="og:site_name" content="&lt;font color&#x3D;&#39;white&#39; &gt;Ethan の Blog&lt;&#x2F;font&gt;">
<meta property="og:description" content="该篇主要讲解Java中线程通讯、线程池">
<meta property="og:locale" content="zh_CN">
<meta property="article:published_time" content="2024-04-26T16:00:00.000Z">
<meta property="article:modified_time" content="2024-04-28T04:54:32.131Z">
<meta property="article:author" content="Ethan Liu">
<meta property="article:tag" content="Java">
<meta property="article:tag" content="Java进阶">
<meta name="twitter:card" content="summary">


<link rel="canonical" href="http://ethanliu6.github.io/2024/04/27/JavaNotes/JavaSE%E8%BF%9B%E9%98%B6/day09/2024-04-27-JavaSE%E8%BF%9B%E9%98%B6%E2%80%94%E2%80%94Day09-%E5%A4%9A%E7%BA%BF%E7%A8%8B%EF%BC%88%E4%BA%8C%EF%BC%89/">



<script class="next-config" data-name="page" type="application/json">{"sidebar":"","isHome":false,"isPost":true,"lang":"zh-CN","comments":true,"permalink":"http://ethanliu6.github.io/2024/04/27/JavaNotes/JavaSE%E8%BF%9B%E9%98%B6/day09/2024-04-27-JavaSE%E8%BF%9B%E9%98%B6%E2%80%94%E2%80%94Day09-%E5%A4%9A%E7%BA%BF%E7%A8%8B%EF%BC%88%E4%BA%8C%EF%BC%89/","path":"2024/04/27/JavaNotes/JavaSE进阶/day09/2024-04-27-JavaSE进阶——Day09-多线程（二）/","title":"JavaSE进阶——Day09 多线程（二）"}</script>

<script class="next-config" data-name="calendar" type="application/json">""</script>
<title>JavaSE进阶——Day09 多线程（二） | <font color='white' >Ethan の Blog</font></title>
  








  <noscript>
    <link rel="stylesheet" href="/css/noscript.css">
  </noscript>
<style>.darkmode--activated{--body-bg-color:#282828;--content-bg-color:#333;--card-bg-color:#555;--text-color:#ccc;--blockquote-color:#bbb;--link-color:#ccc;--link-hover-color:#eee;--brand-color:#ddd;--brand-hover-color:#ddd;--table-row-odd-bg-color:#282828;--table-row-hover-bg-color:#363636;--menu-item-bg-color:#555;--btn-default-bg:#222;--btn-default-color:#ccc;--btn-default-border-color:#555;--btn-default-hover-bg:#666;--btn-default-hover-color:#ccc;--btn-default-hover-border-color:#666;--highlight-background:#282b2e;--highlight-foreground:#a9b7c6;--highlight-gutter-background:#34393d;--highlight-gutter-foreground:#9ca9b6}.darkmode--activated img{opacity:.75}.darkmode--activated img:hover{opacity:.9}.darkmode--activated code{color:#69dbdc;background:0 0}button.darkmode-toggle{z-index:9999}.darkmode-ignore,img{display:flex!important}.beian img{display:inline-block!important}</style></head>

<body itemscope itemtype="http://schema.org/WebPage" class="use-motion">
  <div class="headband"></div>

  <main class="main">
    <div class="column">
      <header class="header" itemscope itemtype="http://schema.org/WPHeader"><div class="site-brand-container">
  <div class="site-nav-toggle">
    <div class="toggle" aria-label="切换导航栏" role="button">
        <span class="toggle-line"></span>
        <span class="toggle-line"></span>
        <span class="toggle-line"></span>
    </div>
  </div>

  <div class="site-meta">

    <a href="/" class="brand" rel="start">
      <i class="logo-line"></i>
      <p class="site-title"><font color='white' >Ethan の Blog</font></p>
      <i class="logo-line"></i>
    </a>
      <p class="site-subtitle" itemprop="description"><font color='#FDABC1' size=3>清醒的停留，胜过——盲目的前行</font></p>
  </div>

  <div class="site-nav-right">
    <div class="toggle popup-trigger" aria-label="搜索" role="button">
        <i class="fa fa-search fa-fw fa-lg"></i>
    </div>
  </div>
</div>



<nav class="site-nav">
  <ul class="main-menu menu"><li class="menu-item menu-item-home"><a href="/" rel="section"><i class="fa fa-home fa-fw"></i>首页</a></li><li class="menu-item menu-item-关于我"><a href="/aboutme/" rel="section"><i class="fa fa-user fa-fw"></i>关于我</a></li><li class="menu-item menu-item-tags"><a href="/tags/" rel="section"><i class="fa fa-tags fa-fw"></i>标签<span class="badge">18</span></a></li><li class="menu-item menu-item-categories"><a href="/categories/" rel="section"><i class="fa fa-th fa-fw"></i>分类<span class="badge">14</span></a></li><li class="menu-item menu-item-archives"><a href="/archives/" rel="section"><i class="fa fa-archive fa-fw"></i>归档<span class="badge">53</span></a></li><li class="menu-item menu-item-love"><a href="/categories/Love/" rel="section"><i class="fas fa-heart fa-fw"></i>Love</a></li>
      <li class="menu-item menu-item-search">
        <a role="button" class="popup-trigger"><i class="fa fa-search fa-fw"></i>搜索
        </a>
      </li>
  </ul>
</nav>



  <div class="search-pop-overlay">
    <div class="popup search-popup"><div class="search-header">
  <span class="search-icon">
    <i class="fa fa-search"></i>
  </span>
  <div class="search-input-container">
    <input autocomplete="off" autocapitalize="off" maxlength="80"
           placeholder="搜索..." spellcheck="false"
           type="search" class="search-input">
  </div>
  <span class="popup-btn-close" role="button">
    <i class="fa fa-times-circle"></i>
  </span>
</div>
<div class="search-result-container no-result">
  <div class="search-result-icon">
    <i class="fa fa-spinner fa-pulse fa-5x"></i>
  </div>
</div>

    </div>
  </div>

</header>
        
  
  <aside class="sidebar">

    <div class="sidebar-inner sidebar-nav-active sidebar-toc-active">
      <ul class="sidebar-nav">
        <li class="sidebar-nav-toc">
          文章目录
        </li>
        <li class="sidebar-nav-overview">
          站点概览
        </li>
      </ul>

      <div class="sidebar-panel-container">
        <!--noindex-->
        <div class="post-toc-wrap sidebar-panel">
            <div class="post-toc animated"><ol class="nav"><li class="nav-item nav-level-2"><a class="nav-link" href="#%E7%BA%BF%E7%A8%8B%E9%80%9A%E8%AE%AF"><span class="nav-number">1.</span> <span class="nav-text">线程通讯</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#%E6%A6%82%E8%BF%B0"><span class="nav-number">1.1.</span> <span class="nav-text">概述</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#api%E6%96%B9%E6%B3%95"><span class="nav-number">1.2.</span> <span class="nav-text">API方法</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#%E7%AD%89%E5%BE%85%E6%96%B9%E6%B3%95"><span class="nav-number">1.2.1.</span> <span class="nav-text">等待方法</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#%E5%94%A4%E9%86%92%E6%96%B9%E6%B3%95"><span class="nav-number">1.2.2.</span> <span class="nav-text">唤醒方法</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#%E6%A1%88%E4%BE%8B%E7%94%9F%E4%BA%A7%E8%80%85%E6%B6%88%E8%B4%B9%E8%80%85"><span class="nav-number">1.3.</span> <span class="nav-text">案例——生产者消费者</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#%E7%BA%BF%E7%A8%8B%E6%B1%A0"><span class="nav-number">2.</span> <span class="nav-text">线程池</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#%E7%BA%BF%E7%A8%8B%E4%BD%BF%E7%94%A8%E5%AD%98%E5%9C%A8%E7%9A%84%E9%97%AE%E9%A2%98"><span class="nav-number">2.1.</span> <span class="nav-text">线程使用存在的问题</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%9A%84%E4%BB%8B%E7%BB%8D"><span class="nav-number">2.2.</span> <span class="nav-text">线程池的介绍</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#%E7%BA%BF%E7%A8%8B%E6%B1%A0%E4%BD%BF%E7%94%A8%E7%9A%84%E5%A4%A7%E8%87%B4%E6%B5%81%E7%A8%8B"><span class="nav-number">2.3.</span> <span class="nav-text">线程池使用的大致流程</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#%E7%BA%BF%E7%A8%8B%E6%B1%A0%E7%9A%84%E5%A5%BD%E5%A4%84"><span class="nav-number">2.4.</span> <span class="nav-text">线程池的好处</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#java%E6%8F%90%E4%BE%9B%E5%A5%BD%E7%9A%84%E7%BA%BF%E7%A8%8B%E6%B1%A0"><span class="nav-number">2.5.</span> <span class="nav-text">Java提供好的线程池</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#%E7%BA%BF%E7%A8%8B%E6%B1%A0%E5%A4%84%E7%90%86runnable%E4%BB%BB%E5%8A%A1"><span class="nav-number">2.6.</span> <span class="nav-text">线程池处理Runnable任务</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#%E7%BA%BF%E7%A8%8B%E6%B1%A0%E5%A4%84%E7%90%86callable%E4%BB%BB%E5%8A%A1"><span class="nav-number">2.7.</span> <span class="nav-text">线程池处理Callable任务</span></a></li></ol></li></ol></div>
        </div>
        <!--/noindex-->

        <div class="site-overview-wrap sidebar-panel">
          <div class="site-author animated" itemprop="author" itemscope itemtype="http://schema.org/Person">
    <img class="site-author-image" itemprop="image" alt="Ethan Liu"
      src="/images/avatar.jpg">
  <p class="site-author-name" itemprop="name">Ethan Liu</p>
  <div class="site-description" itemprop="description"><font color='#0000FF' size=1.5px>语言学 | NLP | Py | Java</font></div>
</div>
<div class="site-state-wrap animated">
  <nav class="site-state">
      <div class="site-state-item site-state-posts">
        <a href="/archives/">
          <span class="site-state-item-count">53</span>
          <span class="site-state-item-name">日志</span>
        </a>
      </div>
      <div class="site-state-item site-state-categories">
          <a href="/categories/">
        <span class="site-state-item-count">14</span>
        <span class="site-state-item-name">分类</span></a>
      </div>
      <div class="site-state-item site-state-tags">
          <a href="/tags/">
        <span class="site-state-item-count">18</span>
        <span class="site-state-item-name">标签</span></a>
      </div>
  </nav>
</div>
  <div class="links-of-author animated">
      <span class="links-of-author-item">
        <span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2V0aGFubGl1Ng==" title="GitHub → https:&#x2F;&#x2F;github.com&#x2F;ethanliu6"><i class="fab fa-github fa-fw"></i>GitHub</span>
      </span>
      <span class="links-of-author-item">
        <span class="exturl" data-url="bWFpbHRvOmxpdWUyMzM2QGdtYWlsLmNvbQ==" title="E-Mail → mailto:liue2336@gmail.com"><i class="fa fa-envelope fa-fw"></i>E-Mail</span>
      </span>
      <span class="links-of-author-item">
        <span class="exturl" data-url="aHR0cHM6Ly9zcGFjZS5iaWxpYmlsaS5jb20vMTMyNzA5OTk3Nw==" title="BiliBili → https:&#x2F;&#x2F;space.bilibili.com&#x2F;1327099977"><i class="fa-brands fa-bilibili fa-fw"></i>BiliBili</span>
      </span>
      <span class="links-of-author-item">
        <a href="/categories/Love/" title="Love → &#x2F;categories&#x2F;Love&#x2F;" rel="noopener me"><i class="fa fa-heart fa-fw"></i>Love</a>
      </span>
  </div>

        </div>
      </div>
    </div>

    
  </aside>


    </div>

    <div class="main-inner post posts-expand">


  


<div class="post-block">
  
  

  <article itemscope itemtype="http://schema.org/Article" class="post-content" lang="zh-CN">
    <link itemprop="mainEntityOfPage" href="http://ethanliu6.github.io/2024/04/27/JavaNotes/JavaSE%E8%BF%9B%E9%98%B6/day09/2024-04-27-JavaSE%E8%BF%9B%E9%98%B6%E2%80%94%E2%80%94Day09-%E5%A4%9A%E7%BA%BF%E7%A8%8B%EF%BC%88%E4%BA%8C%EF%BC%89/">

    <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
      <meta itemprop="image" content="/images/avatar.jpg">
      <meta itemprop="name" content="Ethan Liu">
    </span>

    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
      <meta itemprop="name" content="<font color='white' >Ethan の Blog</font>">
      <meta itemprop="description" content="<font color='#0000FF' size=1.5px>语言学 | NLP | Py | Java</font>">
    </span>

    <span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork">
      <meta itemprop="name" content="JavaSE进阶——Day09 多线程（二） | <font color='white' >Ethan の Blog</font>">
      <meta itemprop="description" content="">
    </span>
      <header class="post-header">
        <h1 class="post-title" itemprop="name headline">
          JavaSE进阶——Day09 多线程（二）<span class="exturl post-edit-link" data-url="aHR0cHM6Ly9naXRodWIuY29tL0V0aGFuTGl1Ni9ldGhhbmxpdTYuZ2l0aHViLmlvL3RyZWUvbWFzdGVyL19wb3N0cy9KYXZhTm90ZXMvSmF2YVNF6L+b6Zi2L2RheTA5LzIwMjQtMDQtMjctSmF2YVNF6L+b6Zi24oCU4oCURGF5MDkt5aSa57q/56iL77yI5LqM77yJLm1k" title="编辑"><i class="fa fa-pen-nib"></i></span>
        </h1>

        <div class="post-meta-container">
          <div class="post-meta">
    <span class="post-meta-item">
      <span class="post-meta-item-icon">
        <i class="far fa-calendar"></i>
      </span>
      <span class="post-meta-item-text">发表于</span>

      <time title="创建时间：2024-04-27 00:00:00" itemprop="dateCreated datePublished" datetime="2024-04-27T00:00:00+08:00">2024-04-27</time>
    </span>
    <span class="post-meta-item">
      <span class="post-meta-item-icon">
        <i class="far fa-calendar-check"></i>
      </span>
      <span class="post-meta-item-text">更新于</span>
      <time title="修改时间：2024-04-28 12:54:32" itemprop="dateModified" datetime="2024-04-28T12:54:32+08:00">2024-04-28</time>
    </span>
    <span class="post-meta-item">
      <span class="post-meta-item-icon">
        <i class="far fa-folder"></i>
      </span>
      <span class="post-meta-item-text">分类于</span>
        <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
          <a href="/categories/Java%E5%85%A8%E6%A0%88/" itemprop="url" rel="index"><span itemprop="name">Java全栈</span></a>
        </span>
    </span>

  
    <span class="post-meta-item" title="阅读次数" id="busuanzi_container_page_pv">
      <span class="post-meta-item-icon">
        <i class="far fa-eye"></i>
      </span>
      <span class="post-meta-item-text">阅读次数：</span>
      <span id="busuanzi_value_page_pv"></span>
    </span>
  
  <span class="post-meta-item">
    
      <span class="post-meta-item-icon">
        <i class="far fa-comment"></i>
      </span>
      <span class="post-meta-item-text">Changyan：</span>
    
    <a title="JavaSE进阶——Day09 多线程（二）" href="/2024/04/27/JavaNotes/JavaSE%E8%BF%9B%E9%98%B6/day09/2024-04-27-JavaSE%E8%BF%9B%E9%98%B6%E2%80%94%E2%80%94Day09-%E5%A4%9A%E7%BA%BF%E7%A8%8B%EF%BC%88%E4%BA%8C%EF%BC%89/#SOHUCS" itemprop="discussionUrl">
      <span id="sourceId::77ff811532c0aea9bb738da94c3101fe" class="cy_cmt_count" itemprop="commentCount"></span>
    </a>
  </span>
  
  
    <span class="post-meta-break"></span>
    <span class="post-meta-item" title="本文字数">
      <span class="post-meta-item-icon">
        <i class="far fa-file-word"></i>
      </span>
      <span class="post-meta-item-text">本文字数：</span>
      <span>758</span>
    </span>
    <span class="post-meta-item" title="阅读时长">
      <span class="post-meta-item-icon">
        <i class="far fa-clock"></i>
      </span>
      <span class="post-meta-item-text">阅读时长 &asymp;</span>
      <span>3 分钟</span>
    </span>
</div>

        </div>
      </header>

    
    
    
    <div class="post-body" itemprop="articleBody"><blockquote class="blockquote-center">
<p>该篇主要讲解Java中<strong>线程通讯、线程池</strong></p>

</blockquote>
<span id="more"></span>
<h2 id="线程通讯">线程通讯</h2>
<h3 id="概述">概述</h3>
<div class="note primary"><p>在多线程程序中，某个线程进入到“<strong>等待状态</strong>”时，必须由其他线程来唤醒“等待状态”的线程</p>
</div>
<h3 id="api方法">API方法</h3>
<h4 id="等待方法">等待方法</h4>
<ul>
<li>特殊之处：会释放掉对象锁</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">wait() <span class="comment">//无限等待（只能由其他线程唤醒）</span></span><br><span class="line">wait(<span class="type">long</span> 毫秒) <span class="comment">//计时等待（时间到了自动唤醒）</span></span><br></pre></td></tr></table></figure>
<h4 id="唤醒方法">唤醒方法</h4>
<ul>
<li>特殊之处：不会释放掉对象锁</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">notify() <span class="comment">//唤醒同一个对象锁上处于“等待状态”的任意一个线程</span></span><br><span class="line">notifyAll() <span class="comment">//唤醒同一个对象锁上处于“等待状态”的所有线程</span></span><br></pre></td></tr></table></figure>
<div class="note primary"><p>wait()方法和notify()方法，都必须绑定在对象锁上。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">Object</span> <span class="variable">lock</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Object</span>(); <span class="comment">//对象锁</span></span><br><span class="line"></span><br><span class="line">lock.wait();</span><br><span class="line"></span><br><span class="line">lock.notify();</span><br></pre></td></tr></table></figure>
</div>
<h3 id="案例生产者消费者">案例——生产者消费者</h3>
<p>共享资源：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> security.demo2;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Author</span> EthanLiu 16693226842@163.com</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Date</span> 2024/4/28 11:39</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Project</span> JavaCode_SE_Advance</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Theme</span> 生产者与消费者----资源</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="comment">//共享资源</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">Resource</span> &#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="type">int</span> <span class="variable">num</span> <span class="operator">=</span> <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="type">String</span> <span class="variable">LOCK</span> <span class="operator">=</span> <span class="string">&quot;对象锁&quot;</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>生产者：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> security.demo2;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Author</span> EthanLiu 16693226842@163.com</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Date</span> 2024/4/28 11:41</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Project</span> JavaCode_SE_Advance</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Theme</span> 生产者</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">ProductTask</span> <span class="keyword">implements</span> <span class="title class_">Runnable</span> &#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">run</span><span class="params">()</span> &#123;</span><br><span class="line">        <span class="keyword">while</span> (<span class="literal">true</span>) &#123;</span><br><span class="line">            <span class="comment">//加入锁对象, 同步代码块</span></span><br><span class="line">            <span class="keyword">synchronized</span> (Resource.LOCK) &#123;</span><br><span class="line">                <span class="comment">//没吃的: 生产</span></span><br><span class="line">                <span class="keyword">if</span> (Resource.num == <span class="number">0</span>) &#123;</span><br><span class="line">                    System.out.println(Thread.currentThread().getName() + <span class="string">&quot;没有生产,开始生产......&quot;</span>);</span><br><span class="line">                    <span class="comment">//生产</span></span><br><span class="line">                    Resource.num = <span class="number">1</span>;</span><br><span class="line">                    System.out.println(Thread.currentThread().getName() + <span class="string">&quot;生产了&quot;</span> + Resource.num + <span class="string">&quot;个&quot;</span>);</span><br><span class="line">                    <span class="comment">//唤醒</span></span><br><span class="line">                    Resource.LOCK.notify();</span><br><span class="line">                <span class="comment">//有吃的: 等待</span></span><br><span class="line">                &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                    System.out.println(Thread.currentThread().getName() + <span class="string">&quot;已生产食物,等待顾客食用......&quot;</span>);</span><br><span class="line">                    <span class="keyword">try</span> &#123;</span><br><span class="line">                        Resource.LOCK.wait();<span class="comment">//无限等待, 会释放掉对象锁</span></span><br><span class="line">                    &#125; <span class="keyword">catch</span> (InterruptedException e) &#123;</span><br><span class="line">                        e.printStackTrace();</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>消费者：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> security.demo2;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Author</span> EthanLiu 16693226842@163.com</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Date</span> 2024/4/28 11:42</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Project</span> JavaCode_SE_Advance</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Theme</span> 消费者</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">CustomerTask</span> <span class="keyword">implements</span> <span class="title class_">Runnable</span> &#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">run</span><span class="params">()</span> &#123;</span><br><span class="line">        <span class="keyword">while</span> (<span class="literal">true</span>) &#123;</span><br><span class="line">            <span class="comment">//同步代码块</span></span><br><span class="line">            <span class="keyword">synchronized</span> (Resource.LOCK) &#123;</span><br><span class="line">                <span class="comment">//没吃的: 等待</span></span><br><span class="line">                <span class="keyword">if</span> (Resource.num == <span class="number">0</span>) &#123;</span><br><span class="line">                    <span class="comment">//等待</span></span><br><span class="line">                    <span class="keyword">try</span> &#123;</span><br><span class="line">                        System.out.println(Thread.currentThread().getName() + <span class="string">&quot;没有发现食物, 等待中......&quot;</span>);</span><br><span class="line">                        Resource.LOCK.wait(); <span class="comment">//无限等待,会释放掉对象锁</span></span><br><span class="line">                    &#125; <span class="keyword">catch</span> (InterruptedException e) &#123;</span><br><span class="line">                        e.printStackTrace();</span><br><span class="line">                    &#125;</span><br><span class="line">                    <span class="comment">//有吃的: 消费</span></span><br><span class="line">                &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                    System.out.println(Thread.currentThread().getName() + <span class="string">&quot;发现食物, 开始消费了&quot;</span>);</span><br><span class="line">                    Resource.num--;</span><br><span class="line">                    System.out.println(Thread.currentThread().getName() + <span class="string">&quot;消费完了&quot;</span>);</span><br><span class="line">                    <span class="comment">//唤醒: 生产者可以继续生产食物了</span></span><br><span class="line">                    Resource.LOCK.notify();</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>测试：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> security.demo2;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Author</span> EthanLiu 16693226842@163.com</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Date</span> 2024/4/28 11:58</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Project</span> JavaCode_SE_Advance</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Theme</span> 生产者与消费者---测试</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">Test</span> &#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">main</span><span class="params">(String[] args)</span> &#123;</span><br><span class="line">        <span class="keyword">new</span> <span class="title class_">Thread</span>(<span class="keyword">new</span> <span class="title class_">ProductTask</span>(), <span class="string">&quot;生产者 &quot;</span>).start();</span><br><span class="line">        <span class="keyword">new</span> <span class="title class_">Thread</span>(<span class="keyword">new</span> <span class="title class_">CustomerTask</span>(), <span class="string">&quot;消费者 &quot;</span>).start();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h2 id="线程池">线程池</h2>
<h3 id="线程使用存在的问题">线程使用存在的问题</h3>
<ul>
<li>如果并发的线程数量很多，并且每个线程都是执行一个时间很短的任务就结束了，这样频繁创建线程就会大大降低系统的效率，因为频繁创建线程和销毁线程需要时间。
如果大量线程在执行，会涉及到线程间上下文的切换，会极大的消耗CPU运算资源</li>
</ul>
<h3 id="线程池的介绍">线程池的介绍</h3>
<ul>
<li>其实就是一个容纳多个线程的容器，其中的线程可以反复使用，省去了频繁创建线程对象的操作，无需反复创建线程而消耗过多资源。</li>
</ul>
<h3 id="线程池使用的大致流程">线程池使用的大致流程</h3>
<ul>
<li>创建线程池指定线程开启的数量</li>
<li>提交任务给线程池，线程池中的线程就会获取任务，进行处理任务。</li>
<li>线程处理完任务，不会销毁，而是返回到线程池中，等待下一个任务执行。</li>
<li>如果线程池中的所有线程都被占用，提交的任务，只能等待线程池中的线程处理完当前任</li>
</ul>
<h3 id="线程池的好处">线程池的好处</h3>
<ul>
<li>降低资源消耗。减少了创建和销毁线程的次数，每个工作线程都可以被重复利用，可执行多个任务。</li>
<li>提高响应速度。当任务到达时，任务可以不需要等待线程创建 ,
就能立即执行。</li>
<li>提高线程的可管理性。可以根据系统的承受能力，调整线程池中工作线线程的数目，防止因为消耗过多的内存
(每个线程需要大约1MB内存，线程开的越多，消耗的内存也就越大，最后死机)。</li>
</ul>
<h3 id="java提供好的线程池">Java提供好的线程池</h3>
<ul>
<li>java.util.concurrent.ExecutorService
是线程池接口类型。使用时我们不需自己实现，JDK已经帮我们实现好了</li>
<li>获取线程池我们使用工具类java.util.concurrent.Executors的静态方
<ul>
<li>public static ExecutorService newFixedThreadPool (int num) :
指定线程池最大线程池数量获取线程池</li>
</ul></li>
<li>线程池ExecutorService的相关方法
<ul>
<li><T> Future<T> submit(Callable<T> task)</T></T></T></li>
<li>Future&lt;?&gt; submit(Runnable task)</li>
</ul></li>
<li>关闭线程池方法（一般不使用关闭方法，除非后期不用或者很长时间都不用，就可以关闭）
<ul>
<li>void shutdown()
启动一次顺序关闭，执行以前提交的任务，但不接受新任务</li>
</ul></li>
</ul>
<h3 id="线程池处理runnable任务">线程池处理Runnable任务</h3>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.itheima.threadpool_demo;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.concurrent.ExecutorService;</span><br><span class="line"><span class="keyword">import</span> java.util.concurrent.Executors;</span><br><span class="line"></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment">    1 需求 :</span></span><br><span class="line"><span class="comment">        使用线程池模拟游泳教练教学生游泳。</span></span><br><span class="line"><span class="comment">        游泳馆（线程池）内有3名教练（线程）</span></span><br><span class="line"><span class="comment">        游泳馆招收了5名学员学习游泳（任务）。</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">    2 实现步骤：</span></span><br><span class="line"><span class="comment">        创建线程池指定3个线程</span></span><br><span class="line"><span class="comment">        定义学员类实现Runnable，</span></span><br><span class="line"><span class="comment">        创建学员对象给线程池</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">Test1</span> &#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">main</span><span class="params">(String[] args)</span> &#123;</span><br><span class="line">        <span class="comment">// 创建指定线程的线程池</span></span><br><span class="line">        <span class="type">ExecutorService</span> <span class="variable">threadPool</span> <span class="operator">=</span> Executors.newFixedThreadPool(<span class="number">3</span>);</span><br><span class="line"></span><br><span class="line">        <span class="comment">// 提交任务</span></span><br><span class="line">        threadPool.submit(<span class="keyword">new</span> <span class="title class_">Student</span>(<span class="string">&quot;小花&quot;</span>));</span><br><span class="line">        threadPool.submit(<span class="keyword">new</span> <span class="title class_">Student</span>(<span class="string">&quot;小红&quot;</span>));</span><br><span class="line">        threadPool.submit(<span class="keyword">new</span> <span class="title class_">Student</span>(<span class="string">&quot;小明&quot;</span>));</span><br><span class="line">        threadPool.submit(<span class="keyword">new</span> <span class="title class_">Student</span>(<span class="string">&quot;小亮&quot;</span>));</span><br><span class="line">        threadPool.submit(<span class="keyword">new</span> <span class="title class_">Student</span>(<span class="string">&quot;小白&quot;</span>));</span><br><span class="line"></span><br><span class="line">        threadPool.shutdown();<span class="comment">// 关闭线程池</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">class</span> <span class="title class_">Student</span> <span class="keyword">implements</span> <span class="title class_">Runnable</span> &#123;</span><br><span class="line">    <span class="keyword">private</span> String name;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="title function_">Student</span><span class="params">(String name)</span> &#123;</span><br><span class="line">        <span class="built_in">this</span>.name = name;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">run</span><span class="params">()</span> &#123;</span><br><span class="line">        <span class="type">String</span> <span class="variable">coach</span> <span class="operator">=</span> Thread.currentThread().getName();</span><br><span class="line">        System.out.println(coach + <span class="string">&quot;正在教&quot;</span> + name + <span class="string">&quot;游泳...&quot;</span>);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            Thread.sleep(<span class="number">3000</span>);</span><br><span class="line">        &#125; <span class="keyword">catch</span> (InterruptedException e) &#123;</span><br><span class="line">            e.printStackTrace();</span><br><span class="line">        &#125;</span><br><span class="line">        System.out.println(coach + <span class="string">&quot;教&quot;</span> + name + <span class="string">&quot;游泳完毕.&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h3 id="线程池处理callable任务">线程池处理Callable任务</h3>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.itheima.threadpool_demo;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.concurrent.*;</span><br><span class="line"></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment">    需求: Callable任务处理使用步骤</span></span><br><span class="line"><span class="comment">        1 创建线程池</span></span><br><span class="line"><span class="comment">        2 定义Callable任务</span></span><br><span class="line"><span class="comment">        3 创建Callable任务，提交任务给线程池</span></span><br><span class="line"><span class="comment">        4 获取执行结果</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">    &lt;T&gt; Future&lt;T&gt; submit(Callable&lt;T&gt; task) : 提交Callable任务方法    </span></span><br><span class="line"><span class="comment">    返回值类型Future的作用就是为了获取任务执行的结果。</span></span><br><span class="line"><span class="comment">    Future是一个接口，里面存在一个get方法用来获取值</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">    练一练：使用线程池计算 从0~n的和，并将结果返回</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">Test2</span> &#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> ExecutionException, InterruptedException &#123;</span><br><span class="line">        <span class="comment">// 创建指定线程数量的线程池</span></span><br><span class="line">        <span class="type">ExecutorService</span> <span class="variable">threadPool</span> <span class="operator">=</span> Executors.newFixedThreadPool(<span class="number">10</span>);</span><br><span class="line"></span><br><span class="line">        Future&lt;Integer&gt; future = threadPool.submit(<span class="keyword">new</span> <span class="title class_">CalculateTask</span>(<span class="number">100</span>));</span><br><span class="line">        <span class="type">Integer</span> <span class="variable">sum</span> <span class="operator">=</span> future.get();</span><br><span class="line">        System.out.println(sum);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 使用线程池计算 从0~n的和，并将结果返回</span></span><br><span class="line"><span class="keyword">class</span> <span class="title class_">CalculateTask</span> <span class="keyword">implements</span> <span class="title class_">Callable</span>&lt;Integer&gt; &#123;</span><br><span class="line">    <span class="keyword">private</span> <span class="type">int</span> num;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="title function_">CalculateTask</span><span class="params">(<span class="type">int</span> num)</span> &#123;</span><br><span class="line">        <span class="built_in">this</span>.num = num;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> Integer <span class="title function_">call</span><span class="params">()</span> <span class="keyword">throws</span> Exception &#123;</span><br><span class="line">        <span class="type">int</span> <span class="variable">sum</span> <span class="operator">=</span> <span class="number">0</span>;<span class="comment">// 求和变量</span></span><br><span class="line">        <span class="keyword">for</span> (<span class="type">int</span> <span class="variable">i</span> <span class="operator">=</span> <span class="number">0</span>; i &lt;= num; i++) &#123;</span><br><span class="line">            sum += i;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> sum;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

    </div>

    
    
    

    <footer class="post-footer">
          <div class="reward-container">
  <div>请我一杯咖啡吧！</div>
  <button>
    赞赏
  </button>
  <div class="post-reward">
      <div>
        <img src="/images/wChat.png" alt="Ethan Liu 微信">
        <span>微信</span>
      </div>

  </div>
</div>

          

<div class="post-copyright">
<ul>
  <li class="post-copyright-author">
      <strong>本文作者： </strong>Ethan Liu
  </li>
  <li class="post-copyright-link">
      <strong>本文链接：</strong>
      <a href="http://ethanliu6.github.io/2024/04/27/JavaNotes/JavaSE%E8%BF%9B%E9%98%B6/day09/2024-04-27-JavaSE%E8%BF%9B%E9%98%B6%E2%80%94%E2%80%94Day09-%E5%A4%9A%E7%BA%BF%E7%A8%8B%EF%BC%88%E4%BA%8C%EF%BC%89/" title="JavaSE进阶——Day09 多线程（二）">http://ethanliu6.github.io/2024/04/27/JavaNotes/JavaSE进阶/day09/2024-04-27-JavaSE进阶——Day09-多线程（二）/</a>
  </li>
  <li class="post-copyright-license">
      <strong>版权声明： </strong>本博客所有文章除特别声明外，均采用 <span class="exturl" data-url="aHR0cHM6Ly9jcmVhdGl2ZWNvbW1vbnMub3JnL2xpY2Vuc2VzL2J5LW5jLXNhLzQuMC8="><i class="fab fa-fw fa-creative-commons"></i>BY-NC-SA</span> 许可协议。转载请注明出处！
  </li>
</ul>
</div>


          <div class="post-tags">
              <a href="/tags/Java/" rel="tag"><i class="fa fa-tag"></i> Java</a>
              <a href="/tags/Java%E8%BF%9B%E9%98%B6/" rel="tag"><i class="fa fa-tag"></i> Java进阶</a>
          </div>

        

          <div class="post-nav">
            <div class="post-nav-item">
                <a href="/2024/04/25/JavaNotes/JavaSE%E8%BF%9B%E9%98%B6/day08/JavaSE%E8%BF%9B%E9%98%B6%E2%80%94%E2%80%94Day08-%E5%BC%82%E5%B8%B8,Lambda%E8%A1%A8%E8%BE%BE%E5%BC%8F,Stream%E6%B5%81%20/" rel="prev" title="JavaSE进阶——Day08 异常、Lambda表达式、Stream流、File类、递归">
                  <i class="fa fa-angle-left"></i> JavaSE进阶——Day08 异常、Lambda表达式、Stream流、File类、递归
                </a>
            </div>
            <div class="post-nav-item">
                <a href="/2024/04/27/JavaNotes/JavaSE%E8%BF%9B%E9%98%B6/day09/JavaSE%E8%BF%9B%E9%98%B6%E2%80%94%E2%80%94Day09%E5%A4%9A%E7%BA%BF%E7%A8%8B%EF%BC%88%E4%B8%80%EF%BC%89/" rel="next" title="JavaSE进阶——Day09 多线程（一）">
                  JavaSE进阶——Day09 多线程（一） <i class="fa fa-angle-right"></i>
                </a>
            </div>
          </div>
    </footer>
  </article>
</div>






    <div class="comments" id="SOHUCS" sid="77ff811532c0aea9bb738da94c3101fe"></div>
</div>
  </main>

  <footer class="footer">
    <div class="footer-inner">

  <div class="copyright">
    &copy; 2023-2024 – 
    <span itemprop="copyrightYear">2024</span>
    <span class="with-love">
      <i class="fa fa-heart"></i>
    </span>
    <span class="author" itemprop="copyrightHolder">Is Ethan's</span>
  </div>
<div class="wordcount">
  <span class="post-meta-item">
    <span class="post-meta-item-icon">
      <i class="fa fa-chart-line"></i>
    </span>
    <span title="站点总字数">113k</span>
  </span>
  <span class="post-meta-item">
    <span class="post-meta-item-icon">
      <i class="fa fa-coffee"></i>
    </span>
    <span title="站点阅读时长">6:51</span>
  </span>
</div>
<div class="busuanzi-count">
    <span class="post-meta-item" id="busuanzi_container_site_uv">
      <span class="post-meta-item-icon">
        <i class="fa fa-user"></i>
      </span>
      <span class="site-uv" title="总访客量">
        <span id="busuanzi_value_site_uv"></span>
      </span>
    </span>
    <span class="post-meta-item" id="busuanzi_container_site_pv">
      <span class="post-meta-item-icon">
        <i class="fa fa-eye"></i>
      </span>
      <span class="site-pv" title="总访问量">
        <span id="busuanzi_value_site_pv"></span>
      </span>
    </span>
</div>

    </div>
  </footer>

  
  <div class="back-to-top" role="button" aria-label="返回顶部">
    <i class="fa fa-arrow-up fa-lg"></i>
    <span>0%</span>
  </div>
  <div class="reading-progress-bar"></div>
  <a role="button" class="book-mark-link book-mark-link-fixed"></a>

  <span class="exturl github-corner" data-url="aHR0cHM6Ly9naXRodWIuY29tL0V0aGFuTGl1Ni8=" title="在 GitHub 上关注我" aria-label="在 GitHub 上关注我"><svg width="80" height="80" viewBox="0 0 250 250" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></span>

<noscript>
  <div class="noscript-warning">Theme NexT works best with JavaScript enabled</div>
</noscript>


  
  <script src="https://cdnjs.cloudflare.com/ajax/libs/animejs/3.2.1/anime.min.js" integrity="sha256-XL2inqUJaslATFnHdJOi9GfQ60on8Wx1C2H8DYiN1xY=" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/next-theme-pjax/0.6.0/pjax.min.js" integrity="sha256-vxLn1tSKWD4dqbMRyv940UYw4sXgMtYcK6reefzZrao=" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/fancyapps-ui/5.0.33/fancybox/fancybox.umd.js" integrity="sha256-+2+qOqR8CKoHh/AsVR9k2qaDBKWjYNC2nozhYmv5j9k=" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/medium-zoom/1.1.0/medium-zoom.min.js" integrity="sha256-ZgMyDAIYDYGxbcpJcfUnYwNevG/xi9OHKaR/8GK+jWc=" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/lozad.js/1.16.0/lozad.min.js" integrity="sha256-mOFREFhqmHeQbXpK2lp4nA3qooVgACfh88fpJftLBbc=" crossorigin="anonymous"></script>
<script src="/js/comments.js"></script><script src="/js/utils.js"></script><script src="/js/motion.js"></script><script src="/js/next-boot.js"></script><script src="/js/bookmark.js"></script><script src="/js/pjax.js"></script>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/hexo-generator-searchdb/1.4.1/search.js" integrity="sha256-1kfA5uHPf65M5cphT2dvymhkuyHPQp5A53EGZOnOLmc=" crossorigin="anonymous"></script>
<script src="/js/third-party/search/local-search.js"></script>

  <script class="next-config" data-name="pdf" type="application/json">{"object_url":{"url":"https://cdnjs.cloudflare.com/ajax/libs/pdfobject/2.2.12/pdfobject.min.js","integrity":"sha256-g2xji1rlE3KsGVClvuxTbcR0Kn2+wtQADSff2Tbb4zA="},"url":"/lib/pdf/web/viewer.html"}</script>
  <script src="/js/third-party/tags/pdf.js"></script>



  <script src="/js/third-party/fancybox.js"></script>



  
  <script data-pjax async src="https://busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script>




  

  <script class="next-config" data-name="enableMath" type="application/json">true</script><script class="next-config" data-name="mathjax" type="application/json">{"enable":true,"tags":"all","js":{"url":"https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-mml-chtml.js","integrity":"sha256-MASABpB4tYktI2Oitl4t+78w/lyA+D7b/s9GEP0JOGI="}}</script>
<script src="/js/third-party/math/mathjax.js"></script>


  <script src="https://cdnjs.cloudflare.com/ajax/libs/quicklink/2.3.0/quicklink.umd.js" integrity="sha256-yvJQOINiH9fWemHn0vCA5lsHWJaHs6/ZmO+1Ft04SvM=" crossorigin="anonymous"></script>
  <script class="next-config" data-name="quicklink" type="application/json">{"enable":true,"home":true,"archive":true,"delay":true,"timeout":3000,"priority":true,"url":"http://ethanliu6.github.io/2024/04/27/JavaNotes/JavaSE%E8%BF%9B%E9%98%B6/day09/2024-04-27-JavaSE%E8%BF%9B%E9%98%B6%E2%80%94%E2%80%94Day09-%E5%A4%9A%E7%BA%BF%E7%A8%8B%EF%BC%88%E4%BA%8C%EF%BC%89/"}</script>
  <script src="/js/third-party/quicklink.js"></script>
<script class="next-config" data-name="changyan" type="application/json">{"enable":true,"appid":"cyxf6tytI","appkey":"90987f30c4b5248baad5a04c7a6abfe1","count":true}</script>
<script src="/js/third-party/comments/changyan.js"></script>

</body>
</html>
